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Trachelipoda :: Trachelipoda (n.pl.) An extensive artificial group of gastropods comprising all those which have a spiral shell and the foot attached to the base of the neck.

Solenoid :: Solenoid (n.) An electrodynamic spiral having the conjuctive wire turned back along its axis, so as to neutralize that component of the effect of the current which is due to the length of the spiral, and reduce the whole effect to that of a series of equal and parallel circular currents. When traversed by a current the solenoid exhibits polarity and attraction or repulsion, like a magnet..

Plagihedral :: Plagihedral (a.) Having an oblique spiral arrangement of planes, as levogyrate and dextrogyrate crystals..

Twist :: Twist (n.) The spiral course of the rifling of a gun barrel or a cannon.

Nautilus :: Nautilus (n.) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata..

Spirillum :: Spirifer (n.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side..

Spiral :: Spiral (a.) Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring..

Gyroidal :: Gyroidal (a.) Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms..

Ladies'' Tresses :: Ladies' tresses () A name given to several species of the orchidaceous genus Spiranthes, in which the white flowers are set in spirals about a slender axis and remotely resemble braided hair..

Trica :: Trica (n.) An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows..

Scutibranchiata :: Scutibranchiata (n. pl.) An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

Maclurea :: Maclurea (n.) A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks..

Caracole :: Caracole (n.) A staircase in a spiral form.

Ring :: Ring (v. i.) To rise in the air spirally.

Twining :: Twining (a.) The act of one who, or that which, twines; (Bot.) the act of climbing spirally..

Spired :: Spire (n.) The part of a spiral generated in one revolution of the straight line about the pole. See Spiral, n..

Sinistrorsal :: Sinistrorsal (a.) Rising spirally from right to left (of the spectator); sinistrorse.

Chank :: Chank (n.) The East Indian name for the large spiral shell of several species of sea conch much used in making bangles, esp. Turbinella pyrum. Called also chank chell..

Twist :: Twist (v. i.) To follow a helical or spiral course; to be in the form of a helix.

Right-handed :: Right-handed (a.) Having the whorls rising from left to right; dextral; -- said of spiral shells. See Illust. of Scalaria.

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